@InProceedings{li-EtAl:2008:PAPERS2,
  author    = {Li, Wenjie  and  Wei, Furu  and  Lu, Qin  and  He, Yanxiang},
  title     = {{PNR2}: Ranking Sentences with Positive and Negative Reinforcement for Query-Oriented Update Summarization},
  booktitle = {Proceedings of the 22nd International Conference on Computational Linguistics (Coling 2008)},
  month     = {August},
  year      = {2008},
  address   = {Manchester, UK},
  publisher = {Coling 2008 Organizing Committee},
  pages     = {489--496},
  url       = {http://www.aclweb.org/anthology/C08-1062}
}